Request drinks in sequence (5)
I believe the answer is:
order
This clue might be a double definition.
'request drinks' is the first definition.
'order' can be an answer for 'request' (an order is a request from someone in authority). I'm not sure about the 'drinks' bit.
'sequence' is the second definition.
(I know that sequence is a more specific form of the action order)
'in' acts as a link.
Can you help me to learn more?
(Other definitions for order that I've seen before include "association" , "peace" , "Command harmony" , "Mr Speaker's plea" , "Right arrangement" .)